OK, so aside from the price of this toy, are there any performance reasons why this itty bitty gizmo wouldn't be quite useful to my ham friends who do portable/mobile microwave operation, as opposed to dragging along a GPSDO or OCXO? Think in terms of frequency error at 10 GHz, 24 GHz or even higher.
Tom Holmes, N8ZM Tipp City, OH EM79 > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Bob Camp > Sent: Tuesday, January 18, 2011 5:55 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Symmetricom CSAC is Cs acting like a Rb unit > > Hi > > In this case, it's an itty bitty gizmo that has some significant compromises in > performance compared to it's bigger cousins. > > Bob > > > On Jan 18, 2011, at 5:47 PM, William H. Fite wrote: > > > Oh gosh, it would never, EVER do to find a li'l bitty product that performs > > as well as our big ole spare rooms full of costly, bulky, heavy, mostly > > antiquated equipment. [?] > > > > > > > > On Tue, Jan 18, 2011 at 5:10 PM, Bob Camp <[email protected]> wrote: > > > >> Hi > >> > >> Simply having cesium in it does not make it a primary standard. Since it's > >> more like a rubidium than anything else, it's a lot easier to think of it > >> as > >> a "really small low power rubidium". One other advantage it may have is > >> that > >> the LED may have a longer life than a normal "light bulb" source. I suspect > >> it's a little early to forecast 20 year (or not) life on these yet. > >> > >> Bob > >> > >> -----Original Message----- > >> From: [email protected] [mailto:[email protected]] On > >> Behalf Of WB6BNQ > >> Sent: Tuesday, January 18, 2011 5:03 PM > >> To: Discussion of precise time and frequency measurement > >> Subject: [time-nuts] Symmetricom CSAC is Cs acting like a Rb unit > >> > >> To the list, > >> > >> If you listen carefully to the Symmetricom slide show, particularly page 3, > >> it will tell you all you need to > >> know: > >> > >> > >> > http://www.brainshark.com/Steve_FatSymmetricom/vu?pi=691826191&dm=5&pau > se=1& > >> > appKey=77<http://www.brainshark.com/Steve_FatSymmetricom/vu?pi=691826191 > &dm=5&pause=1&%0AappKey=77> > >> > >> You will discover that that it is indeed a Cesium operated device. HOWEVER > >> ! It is operated in the same manner > >> as a Rubidium device. Doing such does NOT make it a primary standard. > >> > >> In a Cesium Primary standard, a beam of Cesium atoms are energized to a > >> higher state whose decay give off a > >> photon of light such that being on frequecy produces more light to the > >> detector. In the Rb system, the Rb cell > >> acts simply as a light filter such that when on frequency the light level > >> is > >> reduced as seen by the detector. > >> > >> This Symmetricom CSAC device uses the same process as the Rb method > above. > >> It uses a laser to push light through > >> a chamber of Cesium gas. This Cesium gas is acting as a simple light > >> filter. So in its current state it will > >> not rival it superior cousins except in size and power comsumption and > >> possibly price for performance in some > >> applications. > >> > >> Bill....WB6BNQ > >> > >> > >> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > >> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
